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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Thu, 22 Jul 2021 21:37:24 +0800 Jisheng Zhang wrote: > On Thu, 22 Jul 2021 01:35:23 -0700 > Atish Patra wrote: > > > On Wed, Jul 21, 2021 at 11:12 PM Palmer Dabbelt wrote: > > > > > > On Mon, 19 Jul 2021 00:23:06 PDT (-0700), schwab@linux-m68k.org wrote: > > > > On Jul 19 2021, tongtiangen wrote: > > > > > > > >> On 2021/7/17 14:55, Andreas Schwab wrote: > > > >>> Please use > > > >>> https://download.opensuse.org/repositories/home:/Andreas_Schwab:/riscv:/jeos/images/openSUSE-Tumbleweed-RISC-V-JeOS-efi.riscv64.raw.xz > > > >>> and run it in qemu with u-boot as kernel. > > > >>> > > > >>> Andreas. > > > >>> > > > >> > > > >> Hi andreas: > > > >> I used today's latest mainline code and .config provided by you, and I > > > >> can't reproduce this panic. > > > > > > > > Did you test it like I said above? > > > > > > > > Andreas. > > > > > > I'm getting this on and off, with just > > > > > > CONFIG_VMAP_STACK=y > > > > > > on top of defconfig, when running on QEMU. It's not showing up right > > > now: I'd thought it was an issue with that initrd patch, but it went > > > away when I re-ran the tests so I'm guessing it's something > > > non-deterministic. I'll try to take a look if it comes back. > > > > > > > I got it very frequently on beagleV with the following branch & config. > > https://github.com/esmil/linux/commits/beaglev > > > > beaglev_defconfig > > > > Disabling CONFIG_VMAP_STACK avoids the crash. > > Hi all, > > I think we need to pin the stack before calling get_wchan(), could you please Typo: s/get_wchan/walk_stackframe > try below patch? > > Thanks > > diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c > index ff467b98c3e3..ac7593607fa6 100644 > --- a/arch/riscv/kernel/stacktrace.c > +++ b/arch/riscv/kernel/stacktrace.c > @@ -132,8 +132,12 @@ unsigned long get_wchan(struct task_struct *task) > { > unsigned long pc = 0; > > - if (likely(task && task != current && !task_is_running(task))) > + if (likely(task && task != current && !task_is_running(task))) { > + if (!try_get_task_stack(task)) > + return 0; > walk_stackframe(task, NULL, save_wchan, &pc); > + put_task_stack(task); > + } > return pc; > } > > > > > > > > _______________________________________________ > > > linux-riscv mailing list > > > linux-riscv@lists.infradead.org > > > http://lists.infradead.org/mailman/listinfo/linux-riscv > > > > > > > > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv